“恭喜你当爸爸了”常见的英语表述有:“Congratulations! You've become a father.” 或者 “Congratulations on becoming a father!” 或者 “Congratulations! You are a father now.”
“congratulations”意思是“恭喜;祝贺”,用于向他人表达恭喜的情感。“become”是“成为”的意思,“You've become a father.”意思是“你已经成为一位父亲了”。“on”在这里表示“关于;在……方面”,“Congratulations on becoming a father!” 就是“恭喜成为父亲!” 。“now”表示“现在”,“You are a father now.”即“你现在是一位父亲了”。这些表述都能够传达“恭喜你当爸爸了”的意思。